根据大图获得缩略图

 /***
     * 根据大图获取照片的缩图
     * @param largeImagePath
     * @return
     */
    public static String getWashcarThumbnailPath(String largeImagePath){
        if (largeImagePath != null) {
            int index = largeImagePath.lastIndexOf (File.separator);
            String filepath = largeImagePath.substring (0, index);
            String filename = largeImagePath.substring (index);
            filename = filename.substring (0, filename.indexOf (".")) + "_thumbnail.jpg";
            return filepath + filename;
        } else {
            return null;
        }

    }